• In most of the interviews questions on increment and decrement operators will come in face to face or in written test.
  • Every Java Interview written test will have compulsory one question on increment and decrements operators.
  • Lets see some of the frequently asking java interview  programming questions on increment and decrement operators.
  • I this pre increment and post increment , pre decrement and post decrement topics will cover in below programs.
  • Normal programs: use of increment and decrement in normal scenario is same.
  • They differ in while we use them in expressions.
  • To avoid confusions for basic java learners we provided individual programs.

1.Java Interview program on pre increment operator.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a, b;
  7.      a=10;
  8.      b=++a;
  9.     System.out.println(b);
  10.  
  11. }
  12. }
Output:
  1. 11

2.Java Interview program on post increment operator.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a, b;
  7.      a=10;
  8.      b=a++;
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 11

3.Java Interview program on pre increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= ++a + 1;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 22

4.Java Interview program on post increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a++ + 1;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 21

5.Java Interview program on pre increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= ++a + ++a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 43

6.Java Interview program on post increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a++ + a++;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 41

7.Java Interview program on pre and post increment operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a++ + ++a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 42




8.Java Interview program on pre decrement


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a, b;
  7.      a=10;
  8.      b=--a;
  9.     System.out.println(b);
  10.  
  11. }
  12. }
Output:
  1. 9

9.Java Interview program on post decrement .


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a, b;
  7.      a=30;
  8.      b=a--;
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 29

10.Java Interview program on pre decrement in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= --a - 1;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 18

11.Java Interview program on post decrement in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a-- - 1;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 19

12.Java Interview program on pre decrement in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= --a - --a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 1

13.Java Interview program on post decrement operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.     a= a-- - a--;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 1

14.Java Interview program on pre and post decrement operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.    a= a--  - --a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 2

15.Java Interview program on increment and decrement operator in expression.


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=20;
  7.   a= a--  + ++a;
  8.  
  9.     System.out.println(a);
  10.  
  11. }
  12. }
Output:
  1. 40

16.increment and decrement operators Inside println() method:



  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.    int a=1;
  7.  
  8.     System.out.println(a++);
  9.     System.out.println(a++);
  10.     System.out.println(++a);
  11.  
  12.     System.out.println(a++);
  13.     System.out.println(a++);
  14.  
  15.     System.out.println(a--);
  16.     System.out.println(a--);
  17.  
  18.     System.out.println(--a);
  19.     System.out.println(--a);
  20.     System.out.println(a--);
  21.  
  22. }
  23. }
Output:
  1. 1
  2. 2
  3. 4
  4. 4
  5. 5
  6. 6
  7. 5
  8. 3
  9. 2
  10. 2

17.Java Interview program on increment and decrement operator in println


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.    int i=15;
  7.     System.out.println(i++);
  8.     System.out.println(i--);
  9.  
  10. }
  11. }
Output:
  1. 15
  2. 16

18.Java Interview program on increment and decrement operator in println


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int a=10,b=10;
  7.  
  8.      for(int i=0;i<5;i++){
  9.  
  10.          if(++a>2||++b>2){
  11.             a++;
  12.            }
  13.  
  14.       }
  15.      System.out.println("a= "+a+" b="+b);
  16.  
  17. }
  18. }
Output:
  1. 20
  2. 10

   

19.Java Interview program on increment and decrement operator in loops


  1. package com.instanceofjava;
  2.  
  3. class IncrementDemo{
  4.  
  5. public static void main(String [] args){ 

  6.     int i;
  7.  
  8.     for( i=1;i<4;i++){    
  9.            
  10.          System.out.println(i);
  11.  
  12.       }
  13.       System.out.println("value of i after completion of loop: "+i);
  14.  
  15. }
  16. }
Output:
  1. 1
  2. 2
  3. 3
  4. value of i after completion of loop: 4

20.Java Interview program on increment and decrement




  1. package com.instanceofjava;
  2.  
  3. public class A{

  4.  
  5.  static int a = 1111;
  6.  static
  7.  {
  8.         a = a-- - --a;
  9.  }
  10.     
  11. {
  12.         a = a++ + ++a;
  13.  }
  14.  
  15.  public static void main(String[] args)  {
  16.  
  17.        System.out.println(a);
  18.  
  19.     }
  20.  
  21. }

Output:
  1. 2

Instance Of Java

We will help you in learning.Please leave your comments and suggestions in comment section. if you any doubts please use search box provided right side. Search there for answers thank you.
«
Next
Newer Post
»
Previous
Older Post

6 comments for Top 20 Basic Java Interview Programs on Increment Decrement operators

Select Menu